东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

考虑结构刚度效应的筏基完全共同作用体系分析

ISSN号：1000-8993
期刊名称：工业建筑
时间：0
页码：57-61
语言：中文
分类：TU473.1[建筑科学—结构工程;建筑科学—土工工程]
作者机构：[1]大连理工大学海岸和近海工程国家重点实验室土木水利学院,大连116011
相关基金：国家自然科学基金资助项目（批准号：50579006,50179006）;教育部跨世纪优秀人才培养计划薪究基釜资西项目（教技函[1998]2号）.
相关项目：海洋土的工程特性及其地基的变形机理研究

关键词：筏板基础, 共同作用, 上部结构, 次应力, raft foundation, interaction superstructure second stress

中文摘要：

筏板基础作为软土地基上高层结构的一种重要基础形式，在工程实践中得到了广泛应用。合理考虑上部结构、筏板与地基的共同作用效应具有现实意义。然而目前大多数研究仅限于二维分析，在工程设计中所采用的常规方法尚无法考虑共同作用效应。为此，在考虑地基的弹塑性性质与上部结构及筏板的刚度效应的基础上，在对上部结构、筏板基础与地基三者所组成的共同作用体系进行整体三维空间有限元数值分析。分析结果表明：当考虑三维空间效应时，上部结构和筏板基础的刚度对基础自身内力与变形具有显著的影响，并呈现不同的特征与趋势，但是这种影响具有一定的有限性。同时共同作用所引起的次应力效应、荷载分担转移等效应在工程设计中应予以合理地反映。

英文摘要：

Raft foundations are widely empelyed for high-rise buildings or multi-rise structures founded on soft ground. Therefore the interaction of superstructure, raft foundation and subsoil gets to be considerably significant in the analysis and design of major structures on soft ground with raft foundation. In actual, the conventional methods in engineering design cannot duly reproduce the interaction mechanism of the system and cannot accurately predict the variation characteristics of beth internal forces and deformations ＂of raft foundation. At the same time, the 2-D numerical analysis of interaction system cannot manifest the three-dimensional effect of the interaction. Therefore, both the elastu-plastic behaviour and the contributions of stiffness of superstructure and raft foundation are considered and three＇dimensional numerical analyses of interaction system consisting of superstructure, raft foundation and subsoil are conducted by using FEM. Through the comparactive studies,it is shown that while the spatial effect is taken into consideration,the stiffness of beth superstructure and raft foundation has a definite effect on beth internal forces and deformations of interaction system with different characteristics. However such an effect is limited to a certain extent. Furthermore, the effect of second stress and the transferring of loading sharing of superstructure cannot be overlooked in engineering design.